RS-90-203, Circulating Water Sys Availability Analysis River Bend Nuclear Station
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CIRCULATING WATER SYSTEM AVAILABILITY ANALYSIS RIVER BEND tmCLEAR STATICN by RELIABILI~Y & PERFORMAh'CE ASSOCIATES l
for RELIABILITY SYSTEMS ENGINEERING DEPARTMENT RIVER BEND NUCLEAR GROUP l
_i Frepared by:
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_e Bob Christle Quoc Nguyen l
Reliability Consultant Coop Student
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L App:cved by:
Tom Murpny
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Supervisor-Reliabil(W,y Systemt l
9408290246 940629 PDR COMMS NRCC
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CORRESPONDENCE PDR
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TABLE CF CO!CE:CS
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Objective and Summary r
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r=.,t a.,. 2.'m.4 1 4..,, ymA. ~ u e.1 A.)
Mocel B.)
Trend V
Critical Equipment A.)
Identification l
B.)
Condenser Waterbox Failures j
C.)
Pucp Failures l
VI Cooling Towers i
VII Periodic Maintenance
'e VII:
Recc=mendations IX References X
Figures XI Tables i
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- n the United States today, nuclear power plant personnel are being asked te improve plant performance with limited budgets.
This objective is fc:cing nuclear power plant personnel to focus their attencien en equipment that has a high impact on power generation and public health isk.
Power plant personnel are also
- ying to prevent equipment failure rather than repair equipment after failure.
In the maintenance area, a large amount of interest has been shown in recent years in the use of reliability engineering to help focus the attention of maintenance personnel on high impact equipment.
The nuclear utility industry now has a small body of
- eliability engineers who have been working on Probabilistic Risk i
Assessments (FRA) cf the nuclear units and are familiar with reliability engineering.
The PRA can be used as a tool to a
allocate maintenance resources to important equipment to assure acequate protection of public health risk.
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The reliability enginee:ing techniques used in the PRA's can be extended to the entire nuclear plant.
In some cases, a PRA will have modelled to some degree a number of the systems involved in
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the power production cycle of the nuclear plant.
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River Bend personnel have been following the efforts in the United states - to make use of reliability engineering in areas ether than P cbabilistic Risk I.ssessments to quant:.f y public health risk.
The techniques used in the PRA's are seen as tools to help River Bend personnel make better decisions.
The effort dccumented in this report was motivated by the desire to measure the usefulness of
- eliability engineering techniques in the maintenance area.
The results will be useful not only to l
maintenance personnel but also to operations and engineering j
personnel.
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I Objective and Summary The objective of this analysis is to assist in the development of a
maintenance strategy that will achieve and maintain an acceptable level of Circulating Water system availability and minimire the impact on plant safety.
The equivalent availability of. the circulating Water system has ranged from approximately 9 5% to 100% (Figure 1).
Problems with condenser waterboxes started in mid 1988.
Problems with the CWS pumps started in July 1989.
Since October 1989, there have been no failures of a waterbox and only one short failure of a pump.
The present maintenance strategy has resulted in a high level of Circulating Water System availability in 1990.
The preventive maintenance tasks which are presently being implemented have been
- eviewed against-the operation. history of the components in the system and recommendations for change are included in Section VII.
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Cefinitions Availability l
The probabil ty that a piece of equipment or a system will be operating curing the time when it is desired to have the equipment or system operating.
Can also be stated at the ratio of the operating time to the total time (Up time Total time).
Ecuivalent Availability For equipment or systems that have states of operation besides full power - operation, time spent in reduced power. states can_be converted into equivalent time at full. power.
Equivalent availability is'then defined as the ratio of equivalent time at full power to the total time.
Mean-time-to failure (MT*F)
The statistical average of operating times between failures during the period of interest.
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Mean time-to-recair (MT R)
The statistical average of the time necessary to restore equipment or systems to operability following failures _during the period of interest.
l 12 Month Slidinc Averace t
Data for the parameter to be measured is taken for the last 12 month period and averaged over this 12 month period.
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CNS Availability Model l
A.)
Model l
1 The fi:st cut reliability block diagram for the 'CWS
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availability model was as shown below.
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Pump A Waterbox "A"
Cooling
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Tower "A"
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Pump B Waterbox "B"
Cooling Tower "B"
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Pump C Waterbox "C"
, Cooling k'
Tower "C"
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Pump D Waterbox "D"
, Cooling Tower "D"
l This model was based on the expectation that all four circulating pumps, all four waterboxes, and all four cooling towers would have to operate to achieve 100% power.
Also all 12 components were believed to have a significant impact on system availability.
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Cnce the data was
- llected and analyzed,
- he following abbreviated mocel was : nstruccec.
Pump A Waterbox "A"
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Pump B
'Waterbox "B"
m3/4 4/4 Pump C Waterbox "C" -
t Pump D Waterbox "D"
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The model does not include the cooling towers since their availability was extremely high and had little impact on system availability.
The loss of one circulating pump results in an approximate loss of 10 megawatts electric.
Consequently /
the reliability block diagram model was constructed with a three-out of-four logic for the pumps.
l The reliability blocks contain the following components.
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Pumo A Pumo B Pume C Pumo D CWS P1A CWS-PIB CWS-Plc CWS-P1D CWS-MOV16A CWS MOV163 CWS-MOV16C CWS-MOV16D Waterbox A WaterbOx B Waterbox C Waterbox D CWS MOV4A CWS MOV4 B CWS MOV4C CWS-MOV4D CNDIA/ North CNDIA/ South CND1B/ North CND1B/ South CWS MOVSA CWS-MOV5B CWS-MOV5C CWS-MOV5D l
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l The combinations of success anc failure states f0: the CWS system i
are shown in Table 3.
A summary is shown below along with the equation for the equivalent availability of the CWS system.
l Configuration Power Level Number of States
(%)
4 waterboxes 4 pumps 100 1
4 waterboxes 3 pumps 100 4
4 waterboxes 2 pumps 70 6
4 waterboxes 1 pump manual shutdown 4
4 waterboxes O pumps 0
1 3 waterboxes 4 pumps 80 4
3 waterboxes 3 pumps 80 16 3 waterboxes 2 pumps 70 24-3 waterboxes 1 pump manual shutdown 16 3 waterboxes O pumps 0
4 2 waterboxes 4 pumps 60 6
2 waterboxes 3 pumps 60 24 2 waterboxes 2 pumps 60 36 2 waterboxes 1 pump manual shutdown 24 2 waterboxes O pumps 0
6 I waterbox 4 pumps manual shutdown 4
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1 waterbox 3 pumps manual shutdown 16 1 waterbox 2 pumps manual shutdown 24 l
1 vaterbox 1 pump manual shutdown 16 1 waterbox 0 pumps 0
4 0 waterbox 4 pumps 0
1 0 waterbox 3 pumps 0
4 0 waterbox 2 pumps 0
6 0 waterbox 1 pump 0
4 0 waterbox 0 pumps 0
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100% Power Level I state 4 waterboxes 4 pumps 4 states 4 waterboxes 3 pumps Equation (W)4 (P)4 + 4 (W) 4 (P)3 (1.p) l 80% Power Level 4 states 3 waterboxes 4 pumps 16 states 3 waterboxes 3 pumps Equation 4 (W) 3 (1 W) (P)4 + 16 (W)3 (1-W) (P)3 (1-P)
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70% Power Level 6 states 4 water boxes 2 pumps 24 states 3 water boxes 2 pumps Equation 6 (W) 4 (P) 2 (1.p)2 24 (W) 3 (1-W) (P)2 (1. p) 2 1
60% Power Level 6 states 2 waterboxes 4 pumps 24 states 2 waterboxes 3 pumps 36 states 2 waterboxes 2 pumps Equation 6 (W) 2 (;.w) 2 (p)4 24 (W) 2 ( t.g) 2 (p)3 (;.p) i
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1 3 6 (W) 2 (1.g)2 (p)2 (;.p)2 WHERE W= Availability of waterbox l
Availability of pump P
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Each waterbox and each pump is treated equally with a 12 month sliding average availability calculated using i
all the waterboxes and all the pumps.
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The equivalent availability of the CWS system is calculated by I
taking the probability of being'at 100% success and adding to it
(.8) times the probability of being at 80% success and adding to it (.7) times the probability of being at 70% success and adding to it (.6) times the probability of being at 60% success.
(' ) 4 (P)4 + 4 l' ) 4 (P)3 (1-P)
EA =
W W
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{4 (W) 3 (1 W) (P) 4 16 (W)3 (1-W) (P)3 (1-P)]
+
+
.7 (6 (W) 4 (P) 2 (1.p)2 24 (W)3 (1-W) (P) 2 (1. p) 2)
+
.6. [6 (W) 2 (1.w) 2 (p)4 + 24 (W) 2 (1.w)2 (p)3 (1.p)
+
36 (W) 2 (1.w) 2 (p)2 (1.p)2)
+
4.8W4 P4 - 12.4W P3 4
3 14.4W P4 3
36.8W P3
=
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3 9W'P' - 26.4W P' 10.3 W'P' 28.8 W'PJ - 21.6W'P'
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TREND This analysis covered the power generation periods f:cm January 1,
1986 th:ough September 28, 1990.
The following outage times are not included in the analysis:
10/5/86 through 11/29/86, 9/15/87 through 12/15/87, and 3/16/89 th cugh 6/18/89.
The equivalent availability of the CWS system started out at approximately 97.6%
for the period January 1,
1986 to December 31, 1986 (Figure 1).
The equivalant availability then rose. to essentially 100% in March 1987 and stayed there until June 1988 when problems with the condenser-l waterboxes-started impacting the system availability (Table 1 and Figure. 2).
Problems with the condenser.
waterboxes_ continued in 1989, but since October 1989, there have been no failures cf the condenser waterboxes.
Problems with the ci:culating water pumps started impacting system availability in July 1989 (Table 1 and Figure 3).
Recent l'/, there has been only one short failure of a pump in June 1990.
The effect of the various equipment on the overall-k equivalent availability can be seen in Figure 4.
By October 1990, all equipment availabilities were high and the system i
equivalent availability was 99.9%.
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- dentification An examination of the operating history of the Circulating Water System indicated that the condenser waterboxes and the pump were critical pieces of equipment.
The impact of the cooling towers was not as pronounced as that of the condenser water boxes and pumps.
Individual equipment failures were collected and compiled according to the availability model described in Section IV.
The final result is described in Table 1.
B.
Condenser Waterbox Failures Table 1 identifies 20 failures of the waterboxes during the time period covered.
Table 1 identifies the operating hours the equipment worked before the failure, the failure date, the down hours following the f ailur e,
the accumulated operating en the equipment up to the failure date and a short summary of the cause of the failure and the fix.
Table 2
shows that the mean-time-to-failure of the waterboxes was approximately 5560 hours0.0644 days <br />1.544 hours <br />0.00919 weeks <br />0.00212 months <br /> during the time I-period and the mean-time to-repair was approximately 99 hours0.00115 days <br />0.0275 hours <br />1.636905e-4 weeks <br />3.76695e-5 months <br />.
Most of the failures occurred in 1986 (10 out of 20) and were of short duration.
The failures were predominantly tube leaks.
Some troubles were experienced with the expansion j oints.
Figures 5 and 6 show the distribution of operating hours and repair hours for the waterboxes.
Sixty-five percent of all operating times were below 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />, but each waterbox had one period of substantial operating time without leak.
Waterbox "A" had the longest operating time of 25401 hours.
Ninety-five percent of all down times were below 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />.
On January 20, 1989, Waterbox "B"
was taken out of service and remained out cf service until the start of the refueling outage on March 16, 1989.
This resulted in the longest down time of 1303 hours0.0151 days <br />0.362 hours <br />0.00215 weeks <br />4.957915e-4 months <br />.
The overall availability of the waterboxes was 98.6% for the four year period in Table 2.
The overall trend can be seen in Figure 2.
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Pump Failures 3
Table 1 identifies five failures of the pumps during the time period covered.
Table 1 also identifies times when the pump was tagged out for various reasons, but the tag out was not treated as a failure.
This is due to the pumps being treated as a three-out-of-four logic block in the system model.
It appears that the operating crews will run all four pumps if all four pumps are available, but they do not hesitate to remove one of the pumps from service if any preventive maintenance is scheduled or if the pump starts to develop problems.
The loss of a pump appears to result in about a 10MWe power loss.
Such a loss is not considered significant.
Two of the failures (CWS-Plc on 7/2/89 and CWS-P1A on 8/21/89) resulted in shipping the pump motors to Westinghouse for rewinding of the stators.
The root cause of the failures were vibration related problems.
Changes were made to correct these vibration problems.
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Reports 89 0859 and CR89-0977 also indicate that changes were made to the preventive maintenance lubrication l
practices for the pumps following these failures.
CWS-Plc had accumulated approximately 18400 hours when it failed on 7/2/89.
CWS P1A had accumulated approximately 22900 hours i
when it failed on 8/21/89.
5 The first failure of CWS-P1D was a continuation of work which started in November 1985 and continued through 3/21/86.
This work included the remachining of the pump discharge head at Hahn and Clay in Houston, Texas.
The failure of CWS-P1B on 1/27/87 for work on space heaters could have been designated as idle time and not treated as a failure.
The explicit documentation in the control room log as to the 10MWe increase in the power when CWS Pla was restored to service, led to this event being designated a failure.
As seen in Table 2 CWS-Pla had the highest availability of any pump.
In Table 2 CWS-P1A had the most operating hours, 4
25718.
The mean time to-repair of the pumps, 748 hours0.00866 days <br />0.208 hours <br />0.00124 weeks <br />2.84614e-4 months <br />, is quite long, but this is due to the fact that the pump logic is three-out of-four.
Short down time of a single pump is not treated as a failure.
It is only when the pump is down for long periods of time that a power reduction might occur when another pump also goes down.
The overall trend Of 9.e umes is sea" '-
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2, ling Towers The aclir.g towers
- arely had an impact on power generation during.5e time period covered.
The cooling towers appear to be Operated more in accordance with tracking the normal. service i
1 water temperature than tracking power generation.
The few occasions when the cooling towers did impact power generation were caused by problems in the electrical power supplies to the cooling tower fans.
1) 9/15/86 Began lowering reactor power by 10% due to ground on NJS-LDC2G.
Shutdown cooling tower fans DA, DC, DE, DG.
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Repaired within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
l 2) 9/22/86 Arcing on transformer NJS X3B caused shutdown of 4 i
fans on "B"
cooling tower and 4 fans on "D"
This caused a power reduction due to the inability to maintain circulating water temperature.
Repaired within 12 i
hours.
l 3) 7/27/90 NJS-ACS22 tripped on NJS-SWG1B causing loss of power to "B"
side of cooing towers "A"
and "C".
Restored power to "A"
cooling tower within minutes.
"C" not back in service until 7/29 /90.
Power reduced until "C"
Icstored.
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Individual fans in the cooling towers have had numerous problems.
The cooling towers appear to be able to function effectively with one of the eight fans out of service.
The few times when two or more cooling tower fans have been down due to problems with the fans have been, have been on occasions when temperatures were low and no power reductions were necessary.
Two major areas of trouble have shown up in the fans:
a)
Motor b)
Backstop clutch Figures 7,
8, 9, and 10 indicate the history of the individual fans with respect to these problems.
The following fans have had only minor problems through approximately 30,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation.
Cooling Tower "A"
Fan AC, AE Cooling Tower "B"
- Fans BA, BD, BE, BF Cooling Tower "C" - Fans CA, CS, CC, CD, CF, CG Cooling Tower "D"
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k, The majority cf fan prcblems have involved cooling towers "A" and "D".
Cooling 00wer "C" has had the fewest fan problems.
The fan motors have generally lasted over 20,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> before 4
replacement er major rework has been necessary.
After the 20.000 hour0 days <br />0 hours <br />0 weeks <br />0 months <br /> mark,
- however, almost half of the fan motors have 'been replaced or had a major overhaul.
Fan motors AB, BC, and DC have had major overhauls or been replaced twice.
The problems with the fan backstop clutch appear random in i
nature.
Fans CE, CH, and DG have had the most trouble in this area.
Fans CE, CH, and DG clutches have been replaced twice.
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Fans AA, AD, AF, AG, AH, BC, BG, BH, DC, DE clutches have-been replaced once.
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Fe:icdie Maintenance 1.)
Equipment ID 1CWS-CNDIA Maintenance Task 27 (During Refueling?)
Inspect condenser tubes and expansion joint per CMP-9077.
Observatien This task is not on the list of active PM's for system 103 (CWS),
but showed up in the work instructions search.
Condenser tube leaks have been the biggest contributor to CWS unavailability.
Task addresses a major failure mode and should be included in the active PM's.
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Equipment ID 1CWS-CND1B Maintenance Task 27 (During refueling?)
t Inspect condenser tubes per CMP-9077.
Observation 4'
l This task is not on the list of active PM's for system 103, but showed up in the work instructions search.
The task instructions are different from 1CWS-CNDIA, Maintenance Task 27
(#1 above), because the work instructions for the "1A" l
condenser include provisions for the inspection of the expansion joint.
This task should be included in the active PM's and made identical to task 27 for the "1A" condenser.
3.)
Equipment ID 1CWS-EJ1A,B,C,D EJ2A,B,C,D EJ3A,B,C,D 1'
Maintenance Task 2738 During refueling Check expansion joint for damage or deterioration.
Observation i
If Maintenance Tasks 27, 1CWS-CNDIA,B are included and changed as covered in #1 and #2 above, this task should be deleted.
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Equipment !O 1CWS CNDIA I
Maintenance Task 2760 Frequency 333 (as needed) d-1 i
condenser tube plugging.
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Observatien l
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Condenser tube leaks are the major contributor to. system j
unavailability.
Keep this task..
Expand. work ' instructions j
to provide more details similar to that given in Maintenance Task 58, 1CWS-CND1B (#5 below).
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Equipment 20 1CWS-CND1B k
i Maintenance Task 58
'During refueling
$e Condenser tube plugging on condenser 13-South, 1
i "D" waterbox.
4 Observation i
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1 Maintenance task 2760, 1CWS CNDIA (#4 above) is written for j
plugging tubes on all four waterboxes.
Task 58, 1CWS-CND1B provides a lot of detail for. plugging condenser tubes'en the i
"D" waterbox.
i on all four waterboxes. Recommend having one task for plugging tubes i
Recommend deletion of.this task and either include detail.in maintenance i
task 2760 or proceed with Task 2760 as written which indicates the foreman will
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provide details at time of work.
1 6.)
Equipment ID i
i 1CWS-P1A,B',C,D Maintenance Task 0627 i
Every 13 weeks 1
Inspect pump for signs of leakage, tighten bolts.
[i observation i
s The operating history of'the pumps. have not
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excessive leakage problems.
indicated ~any times during power operation;CWS-P1A has been repacked three CWS-P1C has been repacked one time.
during power operation.
'The Nuclear Operators - Outside check the pumps once a shift.
Equipment j
moving CO a 26 week frequency.
Recommenc 4
i The work instructions for "Ye :
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identi-c.
-.: C'.:2-F10 should be made One words f0r CWS P1B and CWS-Plc which include cautionary a
note to tag out electrical power if-it. is j
necessary to work in housing around rotating shaft.
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~,l Equipment ID 1CWS-SCREENS Maintenance Task 1327 Frequency 333 (as needed)
Inspect and clean screens as necessary.
Observation Keep task.
Possibly change monitoring process. for the delta P across the screens such that when a specified I
delta P is exceeded, the screens are cleaned.
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%vw3 3.)
Equipment ID 1CWS-FM1B,D Maintenance Task 366486 Every 13 weeks Perform Section 8.1.2 of PMP-1085.
Fill top bearing reservoir to proper level with oil'.
Observation This task addresses the failures of CWS Plc on 7/2/89 and CWS-P1A on 8/21/89.
Revision 4 of PHP-1085 was implemented k
to insure that the lower bearings would be lubricated once a quarter.
Keep task but recommend ' moving frequency to 26 weeks.
Quarterly lubrication comes from recommendation of vender but failure history indicates 26 weeks would be adequate.
CWS Plc had accumulated approximately 18400 hours when it failed on 7/2/89.
CWS-P1A had accumulated approximately.
I 22900 hours when it failed on 8/21/89.
A six month lubrication schedule is therefore believed adequate.
9.)
Equipment ID 1CWS-PM1A,C 1
Maintenance Task 36 Every 13 weeks Perform Section 8.1.2 of PMP-1085.
Observation Almost identical to Maintenance Task 366486, 1CWS-FM1B,D, #8 above.
Should be made identical.
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'. 3. ) Equipment :D 1CWS-FM1A,C Maintenance Task 27293678 Ouring refueling Perform FM in accordance with PMP-1085.
Each refueling outage complete Section 8.1.8 of-PMP-1085.
observation l
The megger ' and/or resistance check should be performed during refueling and also before a start if the pump motor had a
long (greater than one. month).
downtime.
Also
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recommended. adding doble' test on motors when performing megger and/or resistance check.
The oil in the upper bearing should be changed every l
refueling.
i 11.) Equipment ID 1CWS-FM1B' Maintenance Task 27293664 During refueling 4
observation Identical to Maintenance Task 27293678,- CWS-P1A and C.
Change task # to make identical.
12.) Equipment ID 1CWS-FM1D i
Maintenance Task 1329367881 During refueling
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observation
)
Identical to Maintenance Task
- 27293678, CWS-P1A and C.
Change task # to make identical.
13.) Equipment ID 1CWS FM1A,B,C,D Maintenance Task 6885 Frequency 333 (as needed) obtain oil sample and forward to chemistry.
observation Can't find any evidence that any use is being made of these oil samples.
Perhaps oil l
char"'~:
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change is determined by s so,.<eep task.
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14.) Equipment :D 1CWS-FN1AA,BA,CA,DA AB,BB,CB,CB AC,BC,CC.DC i
AD,BD,CD,DD AE,BE,CE,DE AF,BF,CF,DF AG,BG,CG,DG AH,BH,CH,DH 1
Maintenance Task 27 for A,B,C 2787 for C During Refueling Inspect drive shaft.
i Change _cil (gear box).
Change cil (clutch).
Inspectifer blade assemblies.
Check torque of all blade clamping hardware.
Check fan calance.
cbservatien Problems with the cooling tower fans are primarily related to motor failure and replacement offer about 20000 hours of operation and troubles with. the backstop clutch at random
,j time intervals.
t Keep this task, i
15.) Equipment :D 1CWS TWR1A Maintenance Task 122736 During refueling Change oil (gear box).
Change oil (clutch).
observation Delete this task.-
Duplication of maintenance task 27, 1CWS-FN1AA, etc. #14 above.
16.) Equipment ID 1CWS-TWR1B-Maintenance Task 1236 During refueling Change oil (gear box) and (clutch).
Observation I
Celete r..__
. a = i..
_cp.; cat;cn cr Task 27, 914 above.
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3 17.1 Equipment :D 1CWS-TWRIA j
Maintenance Task 27 During refueling 1.
Inspect fan blade assemblies.
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Check for signs of imbalance.
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observatien Delete this task.
Duplication of Maintenance Task 27 on
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1CWS FN1AA, etc. #14 above.
4 18.) Equipment ID 1CWS-TWR1B C
i Maintenance Task 8199 During refueling 4
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Inspect fan blade assemblies.
Check for signs of imbalance.
Observatien i
Delete this task.
Duplication of Maintenance Task 27 on 1CWS-FN1AA, etc., #14 above.
j 19.) Equipment ID 1CWS-TWR1C j
Maintenance Task 81 During refueling i
Inspect fan blade assemblies.
1 3
Check for signs of imbalance.
1 Observation 1
j Delete this task.
Duplication of Maintenance Task 27 on i
1CWS FN1AA, etc., #14 above.
l 20.) Equipment ID i
1CWS FNM1BG and all other fan motors j-Maintenance Task 27293678 During refueling Perform PM per PMP 1065.
observation The work instructions for f an BG are the most detailed of any fan for this maintenance task.
Keep task and either provide the same amount of detail for the other f ans or write a generalized verk instrutien r --
a-
=11 eclin; i
C O *.' G. fins.
4 5
a RepCrt O 'c.
RS-?O ;;3 Revision Page 21 ef 61
\\
21.) Equipment ID Cooling tower fan motors Maintenance Task - Undefined observation The review of the cooling tower fan operating history indicated that about 1/3 of the fan motors are replaced af ter approximately 20,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation.
.In order to cut down on forced maintenance, might want to consider replacing or reworking fan motors at approximately 20,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation.
I 22.) Equipment :D 1CWS MOV4C a,
SC 16A,8
)
a Maintenance Task 13272936 During refueling Perform FM to valve operator in accordance with FMP-1205.
j Observation 4
Keep task.
Performing routine valve maintenance during i
j refueling is believed appropriate.
J 23.) Equipment ID 1CWS-MOV4A,B,D
)
1CWS MOVSA,B,D 3
1CWS-MOV16C,D j
1CWS MOV102 j
j Maintenance Task 13272936 During refueling a
Observation Work instructions for these valves don't exist in the l
computer.
Work instructions should be entered.
4 1
4 4
I
a o>
Report
..o.
ES ?C 303 Revrsron Page Of il k
24.) Equipment ID IVPS-MOV6A Maintenance Task 13272936 Frequency 333 (as needed)
Perform functional test per Sec.
8.3, PMP1205.
I MEOl639, Related task Observation Not sure why this task exists.
Section 8.3, PMP1205 requires cycling of the valve and (Record) Measure motor running current (Record) Measure motor operated valve timing HEOl639 has to do with IVPS-P1A, Maintenance Task 2736 which requires greasing the pump bearings semi annually per GMP0015.
Recommend deleting this task.
If anything were to be done to valve, it should be to perform preventive maintenance to valve operator in accordance with PMP1205.
Could be done every refueling or every 104 weeks when checking out pumps.
1 j
25.) Equipment ID 1VPS-MOV6B Maintenance Task 13272936 Frequency 333 (as needed)
Perform funct'ional test per Sec.
8.3, PHP-1205.
MEOl640 (Related task).
Observation Recommend deletion of task.
Situation similar to IVPS-MOV6A, #24 above.
26.) Equipment ID 1VPS-MOV107 Maintenance Task 13272936 Frequency 333 (as needed)
Observation I
work instructions don't exist in computer.
(
~
I Reporp
- c.
RS.90 233 Revision
- . age
- 3 Of 61 i
- 7. ) Equipment :D 1CWS P20 1CWS P21 Maintenance Task 1227 Every 26 weeks l
Change hydraulic fluid in pump.
l observation Have had quite a few problems with these pumps in the bisulfite system (circulating water blowdown dochlorination system) mostly due to clogged valves and piping.
Problems did not impact power production, but can' impact discharge to river.
Problems do not: appear to have major significance.
Keep task and frequency as'is.
Change the work instructions on 1CWS-P21 to be identical to 1CWS-P20 so as to instruct workers to obtain RWP if necessary and provide guidance on the lubricant to be used.
28.) Equipment ID IVPS.P1A,B Maintenance Task 2736 Every 26 weeks I
f Grease pump bearings semi annually.per GMP-0015 observation Keep as is.
29.) Equipment ID 1VPS FM1A,B 1VPS-PM2A,B Maintenance Task 27293678 Every 104 weeks Perform Section-8.2.2 PMP 1065.
observation Section
.8.2.2, PMP 1065 is the motor running check.
Recommend performing the entire PHP 1065 package including lubrication of the motor, etc.
Might want to move frequency to 999 (during refueling).
The work instructions for IVPS-FM2B, Task 2729367 8 do not exist in the computer.
-(
L I
~_-
4 EepoIt. io.
ES*90 2*3 Eevisicn 3
Page 24 Of 61 f
20.) Equipment ID 1VPS-CCOLM1A Maintenance Task 27293678 During refueling Perform Section 8.2.2, PMP 1065 i
Observation Section 8.2.2, FMP 1065 is the motor running check.
Recommend performing the entire PMP 1065 package.
- 31. ) Equipment ID 1VPS-TK4 Maintenance Task 38 Every 4 weeks Fill tank till it overflows.
Observatien Keep as is.
Task appe ts to have been done once a' week until sometime in late 1989.
Moving to 4 week schedule appears to be adequate.
32.) Equipment ID k
1CWS A09-A B09-A C09-A D09-A Maintenance Task 101364 Frequency 333 (as needed)
Perform PM task as necessary.
Perform preventive maintenance in accr.rdance with MCP-1151.
Observation Didn't find any record of these tasks being performed.
23.) Equipment ID 1CWS A07-74 B07 -7 4 C07 -7 4 D07 -7 4 Maintenance Task 132765 Frequency 333 (as needed)
Perform PM task as necessary, Perform preventive maintenance in accordance with MCP-1018.
j Observation Didn't find any record of these tasks being performed.
)
i
L Report '*c.
ES-9 3:3 Revisicn Fage 35 Of il 34.) Equipment ID 10276465 1CWS-D10 1X i
Maintenance Task 10276465 Frequency 333 (as needed)
Perform preventive maintenance in accordance with MCP-1088.
Observation Didn't find any record of this task being performed.
35.) Equipment ID 1CWS-B11-1X Maintenance Task 06132764
Frequency 333 (as needed)
Perform PM task as necessary.
Perform preventive maintenance in accordance with MCP 1010.
Observatien a
Didn't find any reccId of this task being performed.
36.) Equipment ID 1CWS-N03-33Y 1CWS-N21-71W1 i
(
Maintenance Task 106579 Frequency 333 (as needed)
Perform preventive maintenance in accordance with MCP-1130.
Observation Didn't find any record of this task being performed.
- 37. ) There are a number of Instrument and Control maintenance tasks which are applicable to the circulating Water System but have not been listed here.
In the past these I&C maintenance tasks are generally cancelled as they come due.
Deletion of these tasks is recommended except for any tasks deemed necessary by the I&C maintenance supervisor.
The practice should be that this equipment is allowed to fail and be replaced after failure.
The monthly program that monitors the availability of the CWS system will help point the ILC maintenance tasks that should be reinstated into out the program if problems arise in the future.
(
i e
i RepoIO !.'o.
Ap.90 2g3
(
Revision 0
Fage 26 Of 61 l
(
VI!!. Recommendations The equivalent availability of the circulating Water System has risen back to a very high level in October 1990.
Problems with
{
the condenser waterboxes and CWS pumps appear to have been fixed.
No recurring failure.cause is showing up in the 1990 operating l
history.
l Emphasis should be placed on maintaining the high level of system availability.
The monthly update of the System Availability
[
Report summary section should help monitor the CWS availability and help measure the ef fectiveness of the new condenser cleaning system.
Recommendations for changes in the preventive maintenance tasks are listed in Section VII.
i I
l l
\\
I l
k
~
a Report Mo, RS.90 203 Revision 0
Page 27 of 61 IX. References 1.)
Control Room Log, January 1986 through September 1990.
2.)
Clearances on Circulating Water Ofstem equipment, January 1986 through September 1990.
3.)
Condition Reports on CWS equipmer.t,
Ja.tiuary 1986 through September 1990.
4.)
Operator relief checksheets, Janua2y 1996 through July 1990.
S.)
Maintenance Work Orders on CWG equipmenc.
January 1986 through September 1990.
6.)
Shift Technical Advisor Daily Log /CI tical Component List, August and September 1990.
f i
t.
t s
t I
+.
I I
^
CRCu_A~\\3 M El SYSiv AVA _A3_
Y
'2 VE\\~- SZ\\G AVERASE
~
100x
=
==
==
p..
98%
96%
\\
9A% :- --- - - -
2 1 E
- u..n.
l' e t 87 l
88 I
89 90 I
u"m l'I t'llPl'. I 5,
b U
LJ m
m
3 L_A~ N3 Wil SYS - A__ Wil3 EXES AVA'_A3MY
'2 VO\\" SC \\G AVElAGE 100%
.no;ucusoco'-
p
/
BB%
s 92% --
- r;;
iQ <- 't)
(D I
- O (13 ii I*at 90%
'Fi@iJJASONDJFt#1JJASONDJFr@iJJASOND
'' " ut2222 " ut " '2222 u 'u u u'2~
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- I *. #.
DJ 87 l
88 I
89 I
-90 I
i risant 2
. ~ ".
oh 56
~-
.m.
,~
370
_A~ \\ 3 WEl SYS~EV - A__ J
. V JS AVA _A3
_ ~Y - L2 V0ix ~- S_ J \\G AVilAGE 100%
p x
- ,= 1
- 112 = : = = n 1.-
h 98% -- A--
.f i,1 3
gg7, _.
I gf%..I J
,$...g*
5 o
.m e t v
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'''''''''' " u a8'''
a u " u ui-'
a DJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 87 i
BB I
89 I
90 I
o e-sn F ICllRE l o.
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8*
a6 9.5
. ~ -
- . 4, RCiA \\S WR SVS -V AVA _A3_TY
'2 VO\\~- SZNG AVERASE 100%
wwwwwee==o&&ge ^ ^ ^
^ : ^
- ===-
98%
l 96%
94%
"=
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- 99y, 90 % ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' "" ' ' ' ' ' ' ' ' ' ' ' i ' *" ' ' ' ' ' * - "
.a *.a DJ FM41J J ASONDJFMAMJ JASONDJFMAMJ JASONDJFMAMJJ 87 I
88 1
89 I
90 I
EQUlV AVAILABILITY
-u-W\\TER BOXES ii PUMPS
((
-v 1 I(:lli l' 4
l l
sw-
- L*
i
- "I" "I
o ou J
W ER3CXES 0~5 JANUARY l 1986 TO DECEMBER 31.1989 20 EVENTS h
Vk O.t1
- e.
iii.:
MTIF (5.560 hours0.00648 days <br />0.156 hours <br />9.259259e-4 weeks <br />2.1308e-4 months <br />)
C 9
0.3
- -C f a,
... U 1
PP P
?
[;. S ss y
02 bP-y ini
- . g 46
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4 a a a
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OPERATING HOURS N ;-i 0
d a o 's,d r ',
' adoo '
isoah
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- ~ i;;
i 9
2 4 9 6 k9 8
12 99 16I991999 25I99 00 l00 5 06 7000 1 b9 3 IS9 5 $9 7b99 o
s.
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- 6 l'lGimi: 5 i
-+.
~
o o
z ev rv v
ve a
a W E K XES 0.7
!:im 0.6
- a
.. it MTTR [98.6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />sl HI:
0.5 l! ~
.,a o
- E 0.4
- u
. 0; i
ibi 0.3
?i lq !2 0.2
'e.1I?
0.1 MREPAIR HOURS
[,!
0 Mo ' 2do ' 3o'o 100
'oo ' sdo ' 70o ' sod
' 9oo ' i oo 'Tbf f do 5
a li9 2I9 o
I so iso 2539 49 sI250 SI9fk9 ssa 7s89 97#soi !{b9 so :49ii49 i
1349 l',' '
- il,'
3so 4so eso i9so B
/89 2 %
339
- 9 s'#9 SI9 fd9 BI9 909 lo 1' k9 12b9 5.
I k' lIe'hlh$ h. IB
t
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ll ll npo n
p, v
OOO O-
~
h's ~iiliihtion AA lace bearings ii, se,i s J i l\\B bac.kstop clutch i
[.
i i hiah vibration isotor burnt un
.n w
- repface motor replace new motor AC iehie.T ace es
n replace new b p clutch AD n
repair me r :
N'
[
i betW k
uC lholor :
AF d.
ein ::s ::
Dr rD :D
<Q +: ',t) te ace bhafi$g$
AH i
.-,=tm.te%ich to e t 1
______1
- I
u
.1 l
0 5
10 15 20 25 30 i
lx 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />!
.i.
t e l'l t:lll l: 7 ta
k
^
p 11 ll ooo n
g v o o, O
o
[
BA i
i high vibration on I"otor BB i
n gmotor vigtlon
[ trip dge ere rent "PI*Ce new ba1c sNp clutch BC i Ftplace new Mtor BD i
BE i
BF i
i j
j j
high vibration on for ter replace new ann BG i
j replace new backsWp clutc) 2 aee e<u j
= pine.akdi no.J.se.
- ';3 motor m e
ear g BH i
!: a m
_i__ _ _ _ [_
j
[ clutM sgo t
gagt seat 0
5 10 15 20 25 30 lx 1000 hour0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />sl i"..
t s.
l'It:llitE li 1
~
r II n Il noo g
l O
UOd O
g i
CA i
i
^
CB CC i
CD i
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l ***Ayr,VTd g,iat
'"r#2fe'#1't#**
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i i
V CF
^
CG
.o :o :..
pgm
.o,< u e,n fetai sealle ei s e
= ai = = cio.,'i n,**rai,a CH gg,e=ci.ici y..
7,.
._i_
0 5
10 15 20 g9 30 i-a fx 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />) 3 o
t f.
4 a 4
g
- _ _ _ _.... _ _ _.. _..._ _.... m. _... _... _ _ _. _. _ _ _ _..._ _ _ _ __._._ -. _._. _. _ _. _. _. _._ _.m t
e T-ll ll moo o
g 4
m motet has high vWration repipce met 6r bearings DB i
l moto has vib ation:l und fault re lari be stop flutch ns '
ace motor reag- -===..r n v
s.
es backston ulch losine its lebricant seal fe. ir the backstop clutch DE n
v i
DF n' h vibrat a moto'r Nalt/bacg!sh'lutch gn
repajr me r bea gs :
i.
sasta e new p cle i
3 au :o :o m.
g <g m, v :
m e
,,. o,
.i
- $'#1 A"jfll'dlii
!P,..'.
m, DH 1.
. _1.
I
_1 1.
0 5
10 15 20 25 30 M "i:l lx 1000 hour0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />sl 4
o i.
FICllPE 10
ReFO:: :::.
R2 9: ::2 Revis* n Page 23 cf .
{
TABLE 1 CWS'WATERBOX "A"
UP FAILURE DOWN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/F X 1111 03/04/86 28 1111 Clearance 86-0407.
MWR020531.
Plugged tubes.
55 03/08/86 13 1166 Clearance 86-0422.
MWR021058.
Roll 5 tubes.
Plug 13 tubes..
238 03/18/86 23 1404 Clearance 86 0497.
MWR017943.
Investigate leaks.
25401 10/28/89 61 26805 Clearances 89-2609, 2627.
HWR130066,.132385.
Plugged 7 tubes 10/28/89.
Ran.
Shutdown.
Plugged 21 more tubes 11/01/89.
Ran.
Shutdown. Plugged 1 more tube on 11/01/89.
\\
(
i I
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t I
f l
EspO :..:.
RS f: 2.':
Revis;On Fage 29 cf ~;
~..~..: = =.-
CWS WATERECX "B"
UP FAILURE DOWN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/FIX 1229 03/09/86 77 1229 Clearance 86-0424.
Plug tube leaks.
126 03/17/86 51 1355 Clearance 86-0491.
MWR018031.
Plugged 25 tubes.
4374 12/02/86 20 5729 Clearance 86-2410.
Investigate and repai: tube leaks.
16214 01/20/89 1303 21943 Clearance 89 0094.
MWR128663.
Isolate leak at expansion joint.
ns Ee?O!"
'0.
F.5-::
Revis1:n Page 40 cf 6.
[
TAELE _
CWS WATERBCX "C"
UP FAILURE DONN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/FIX 1249 03/09/86 11 1249 Clearance 86 0423.
Plug tube leaks.
18876 10/22/88 26 20125 Clearance 88-1022.
MWR123857.
Plugged tubes.
989 12/03/88 17 21114 Clearance 88-1193.
MWR123863, 121535, 121539.
Plugged tubes.
Revised torque switch bypass setting on CWS-MOV4C and CWS-MOV5C.
2705 06/27/89 55 23819 Clearances 89-2056, 2067.
MWR's 122172, 122325.
Plugged 45 tubes on 06/27/89.
Ran.
{
Shutdown. Plugged 3 more tubes on 06/30/89.
Condition Report 89-0845.
Eeper: ::c.
E3-9 Revisten Page 41 ef i; T.'. L : _
k OWS WATERECX "O"
UP FAILURE DOWN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/FIX 1056 03/04/86 28 1056 Clearance 86-0407. MWR020530.
Rolled and plugged tubes.
55 03/08/86 13 1111 Clearance 86-0421. MWR021059.
Plugged 16 tubes.
17 03/09/86 87 1118 Clearances 86-0426, 0492.
MWR's 021071, 018034. At least 9 tubes plugged.
15397 05/28/88 36 16515 Clearance 88-0517. MWR056164.
Plugged 25 tubes.
Problem with bolts on lower flange.
Air gap between flange and tube sheet gasket.
Stripped bolts.
Condition Report 88-0428.
134 06/04/88 16 16649 Clearance 88-0533. MWR116640.
Plugged tubes.
1340 07/30/88 4
17989 Isolated waterbox for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> while considering searching for leaking tubes.
I 145 08/06/88 38 18134 Clearance 88 0730.
MWR124722.
Installed approx. 200 plugs.
Repaired gasket area-on side of waterbox.
4579 02/14/89 64 22713 Clearance 89-0236. MWR133560.
Installed expansion joint and rubber spacer on top of ex-pansion joint.
Modification Reques: 89 0013.
Condition Report 89-0115 indicates all eight expansion j oints are over extended, six have cracks on the body of the joint, the four expansion joints on the outlet side are suffering free
(
pipe misalignment and.1CWS-I:23 is sever e;/ callecnec out.
Repc:
7.5 F: ;;"
RevrsIrn Page 42 If 51
-=v
(
bUSIPik UP FAILURE DOWN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/FIX 02/18/86 762 Idle 218 hrs. -Operator relief checksheets indicate pumps tagged out for bearing cooling water modification.
'01/21/88 12034 Idle 456 hours0.00528 days <br />0.127 hours <br />7.539683e-4 weeks <br />1.73508e-4 months <br />.
Clearance 88-0069.
MWR101350, 103163, 104957.
Implement Modifica2i on Requests MRS6 -
0885 and MR87-0491.
03/23/88 13074 Idle 5 hrs.
Clearance 88-0317.
MWR117747.
Repack pump.
08/08/89 22852 Idle 228 hrs. Clearances 89-2223, 2243, 2261, 2262.
(
MWR125281,_133801. Replace motor bearings.
22932 08/21/89 299 22932 Pump tripped.
Stater windings failed.
Sent motor to Westinghouse for repair.
Condition-Report 89-0977 Clearances 89-2273, 2329.
MWR056451.
Power loss due to CWS-P1B also being inoperable:
l Similar to CWS-Plc on 7 /02/89.
12/04/89 25159 Idle 48 hrs.
Clearance 89-2826.
MWR128933.
Repack pump.
1 03/28/90 l
27800 Idle 824 hrs.
Clearance 90-0432.
MWR121978, 121977 Implement MR86-0885, 87 0437, 86-0880, 87-0722.
05/19/90 28198 Idle 12 hrs. Clearance 90-0675.
MWR137662.
Repack pump.
(
~
l s.
Reper r ;0 ES-90-2~2 Revis On Page 41 ci 61
(-
TAELE.
CWS P13 UP FAILURE DOWN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/FIX 02/16/86 997 Idle 310 hrs.
Operator relief checksheetsLindicate pumps tagged out for bearing cooling water modification.
6647 01/27/87 35 6647
'QWS-P1B was secured f'r work o
on space heaters.
MWe increased 10 MWe when CWS-P1B was placed back in service.
06/19/87 10024 Idle 174 hrs. Clearance 87 -
0621.
MWR.103164, 104960.
'I Implement MR86 -0885 and MR87 -
0327.
11/29/88 19832 Idle 2557 hrs.
Pump shutdown
[.
per request of Mechanical Maintenance.
Kept shutdown i
until outage starting March 1989.
Other pumps had no failures during'this time, therefore no power lost.
08/18/89 21083 Idle 103 hrs.
Clearance 89-2264.
MWR122644.
Repaired lower bearing.
09/09/89 21497 Idle 802' hours.
Clearances 89-2359, 2496.
MWR122644.
1 Sent motor out for rewind.
07/13/90
'27777 Idle 6 hrs. Clearance 90 0925.
k w-a
t Repc:: ::c.
RS F:
- l Revisien Page 44.
f s i 1
f T 2.2 *
\\
CWS F1C Up FAILURE DOWN ACCUMULATED HOURS DATE HOURS UP HOURS FAILURE CAUSE/FIX 02/27/86 258 Idle 43Lhrs.
Clearance 86-0367.
MWR017815.
Tie in permanent bearing cooling water piping.
03/27/86 777 Idle 473 hrs.
Preventive maintenance tasks.
04/24/86 939 Idle 7 hrs.
Clearance 86-0823.
Pump inspection.
08/10/86 3087 Idle 677' hrs.
Vibration i
problem.
Pump shutdwon and kept down util refueling.
Other pumps had no failures during this time, therefore no power loss.
k' 04/05/87 6140
' Idle 39 hr s. Pump shutdown to l
check vibration.
MWR104794.
06/03/87 7499 Idle ~630 hrs. Clearances87-548, 556, 652, 656, and 659.
MWR103165, 104970. Implement MR87 - 0 3 27. Also clean screen.
l 09/06/98 15546 Idle 1982 hrs.
Clearances 88-0917.
MWR112887.
Replaced impeller, impeller case, 7
suction bell.
Implement MR87 -
l 0437.
18387 07/02/89 755 18387 Clearances 89-2083, 2087, 2191, 2193.
Condition Repor:
89-0859.
MWR056354.
State:
damage.
Motor sent to Westinghouse for rebuild.
05/04/90 24978 Idle 29 hrs. Clearance 90-0615.
To install vibration struts to pump pe: MRB7 0437
(
7/14/90 26655 Idle hrr. Clearance i;- izi Repack pump.
i
-. =..
'O i
o a
i Reper:
.MO.
R5-+: 20:
Revrsron
}
Page 45 Of 62 1
i 1
j
{
TABLE 1 i
CWS-P1D d
'i i
UP FAILURE DOWN ACCUMULATED 8
HOURS DATE HOURS
.tE? HOURS FAILURE CAUSE/FIX l
I l
01/01/86 1904 Continuation of failure on l
11/26/85.
Vibration problem.
J j
MWR005343.
l J
04/01/86 61 Idle 443 hours0.00513 days <br />0.123 hours <br />7.324735e-4 weeks <br />1.685615e-4 months <br />.
Clearances i
3 86-0638, 0772.
MWR018260.
j Continued vibration problem.
i 1
07/08/86 i
1484 Idle 799 hours0.00925 days <br />0.222 hours <br />0.00132 weeks <br />3.040195e-4 months <br /> =.
Clearance 96-1434.
MWR042661.
Pump breaker won't close on start I
signal.
1 05/22/87 5532 Idle 263 hrs.
Clearances 87-1 0522, 0534.
MWR103823.
Inspected lower bearing, impeller.
i
{
06/24/87 6063 Idle 14 hrs.
Clearance 87-1 3
0654.
Motor bearing j
adjustment.
MWR106257.
1.
i 01/26/90 24121 Idle 1457 hrs.
Clearances 90-f-
1 0114, 0152.
MWR121970;
'21971.
Rebuild pump and I
motor.
Other pumps had no i
failures during this time, therefore no. power loss.
i 4
j 25841 06/08/90 24 25841 Clearance 90 0727.
Replace i
pump shaft seal.
MWR139336.
}
Repaired bearing cooling ware:
j line.
Condition Report 90-0510.
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RS 9:-1:3 Revision 3
Page 46 Of 61 i
TABLE 1 CIRCU: AT::!iG WATER SYSTEM 1986 1987 1988
'1989 TOTAL i
WATERBOX Run Hours 6514 6600 8698 6443 28255 "A"
Fail Hours 64 0
0 61 125 Availabilry 99.0%
100%
100%
99.1%
99.6%
Failures 3
0 0
1 4
MTTF (hrs) 2170 6443 7060 MTTR (hrs) 21.3 61 31.2 WATERBOX Run Hours 6385 6436 8649 5163 26633 "B"
Fail Hours 148 0
0 1303 1451 l
Availabilry 97.7%
100%
100%
.79.8%
94.8%
t Failures 3
0 0
1 4
MTTF (hrs) 2130 5163 6660 MTTR (hrs) 49.3 1303 363
/
i
\\
WATERBOX Run Hours 6680 6440 8666 6446 28232 "C"
Fail Hours 11 0
43 55 109 Availabilry 99.8%
100%
99.5%
99.2%
99.6%
q Failures 1
0 2
1 4
MTTF (hrs) 6680 4330 6450 7060 MTTR (hrs) 11 21.5 55.0 27.2 WATERBOX Run Hours 6357 6600 8690 6440 28087 "D"
Fail Hours 128 0
94 64 286 Availabilry 98.0%
100%
98.9%
99.0%
99.0%
Failures 3
0 4
1 8
~
MTTF (hrs) 2119 2170 6440 3510 MTTR (hrs) 42.7 23.5 64 35.5 ALL Run Hours 25936 26076 34703 24492 111207 j
i Fail Hours 351 0
137 1483 1971 Availabilty 98.7%
100%
99.6%
94.3%
98.3%
Failures 10 0
6 4
20 MTTF (hrs) 2590 5780 6120 5560
(
MTTR 'hrr' 31.1 22.5 371 95.6 l
E9PCI
..O, E3 9 0-2 : 3 Rev:sien Page 47 Of 6;
{
TAELE.
CIRCULATING WATER SYSTEM (CONT.)
1986 1987 1988 1989 TOTAL 1CWS P1A Run Hours 5912 6072 7882 5852 25718 i
Fail Hours 0
0 0
299 299 Availabilty 100%
100%
100%
95.1%
98.8%
1 Failures 0
0 0
1 1
MTTF (hrs) 5850 25700 MTTR (hrs) 299 299 3
1CWS-P1B Run Hours 6002 6134 7696 3290 23122 Fail Hours 0
35 0
0 35 Availabilty 100%
99.4%
100%
100%
99.8%
i Failures 0
1 0
0 1
MTTF (hIs) 6134 23100
)
MTTR (hrs) 35 35 1CWS-P1C Run Hours 3882'
.5883 6600 5644 22009 Fail Hours 0
0 0
-755
'755
-Availabilty 100%
100%
100%
88.2%
96.7%
Failures 0
0 0
1 1
MTTF (hrs) 5644 22000 MTTR (hrs) 755 755 1CWS-P10 Run Hours 2809 5650 8675 6363 23497 Fail Hours 1904 0
0 0
1904 Availabilty 59.6%
100%
100%
100%
92.5%
Failures 1
0 0
0 1
MTTF (hrs) 2000 23500 MTTR (hrs) 1900 1900 ALL Run Hours 18605 23739 30853 21149 94346 Fail Hours 1904 35 0
1054 2993 Availabilty 90.7%
99.9%
100%
95.3%
96.9%
Failures 1
1 0
2 4
MTTF (hrs) 18600 23700 10600 23600 MTTR (hrs) 1900 35 527 748
Re: :: Sc.
F.5 i:-:::
Revisten Page 4s of i; I
..:. _r_.= -
(
The combinations of success and failure states for the CWS
. system are as follows:
s E
Success f
failure
=-
Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System-A B
C D
A B
C D
s s
s s
s s
s s
100%
s s
s s
s s
s f
100%
s s
s s
s s
f s
100%
s s
s s
s s
f f
70%
s s
s s
s f
s s
100%:
s s
s s
s f
s f
70%
f s
s s
s s
f f
s 70%
s s
s s
s f
f f
manual shutdevn s
s s
s f
s s
s 100%
s s
s s
X.
f s
s f
70%
s s
s s
f s
f s
70%
s s
s s
f s
f f
manual shutdewn s
s s
s f
f s
s 70%
s s
s s
f f
s f
manual shutdown s
s s
s f
f f
s manual shute:wn s
s s
s f
f f
f 0
(
s s
s f
s s
s s
50%
9
F Repor: 20.
ES-9: 2:3 l
Revision 0
l Page 49 cf 6.*
l
{
4 l
Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System l
A B
C D
A
.B C
D i
s s
s f
s s
s f
80%
i s
s s
f s
s f
s 80%
l t
l s
s s
f s
s f
f 70%
s s
s f
s f
s s
80%
s s
s f
s f
s f
70%
s s
s f
s f
f s
70%
s s
s f
s f
f f
manual shutdown s
s s
f f
s s
s 80%
s s
s f
f s
s f
70%
s s
s f
f s
f s
70%
4 s
s f
f s
f f
manual shutdown s
s s
f f
f s
s 70%
s s
s f
f f
s f
manual shutdown s
s s
f f
f f
s manual shutdown s
s s
f f
f f
f 0
s s
f s
s s
s s
80%
s s
f s
s s
s f
80%
s s
f s
s s
f s
80%
s s
f s
s s
f f
70%
s s
f s
s f
s s
80%
(
s s
f f
s f
70i
i Repo:: ::c.
R5-;;.;;2 1
Revision-j Page 0 c f 61 i
1 1
3 2
i Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System j
A B
C D
A B
C-D t
s s
f s
s f
f s
70%
(
2 s
s f
s s
f f
f manual 4,
shutdown f-
{
s s
f s
f s
s s
80%
l' 2
s s
f s
f s
s f
70%
i.
}
s s
f s
f s
f s
-70%
1 e
s s
f s
f s
f f
manual i
shutdown s
s f
s f
f s
s 70%
(
i s
s f
s f
f s
f manual 4
4 shutdown d
s s
f s
f f
f s
manual 1
shutdown s
s f
s f
f f
f 0
l i
s s
f f
s s
s s
60%
s s
f f
s s
s f
60%
4 s
s f
f s
s f
s 60%
4
.i s
s f
f s
s f
f 60%
i s
s f
f s
f s
s 60%
1 1
s s
f f
s f
s f
60%
1 s
s f
f s
f f
s 60%
1 i
s s
s f
f s
f f
f manual i~
1 shutdown i
s s
f f
f s
s s
60%
1 a,
i; s
s f
f f
s s
f 60%
i i:
s s
f f
f s
f s
60%
d i
4 1
J i
~
- spO:: ::0.
r.
j
- ..ev sic..
Page 5; cf i; Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D A
.B C
D s
s f
f f
s f
f manual shutdown s
s f
f f
f s
s 60%
s s
f f
f f
s f
manual shutdown s
s f
f f
f f
s manual shutdown s
s i
f f
f f
f 0
l s
f s
s s
s s
s 80%
s f
s s
s s
s f
80%
s f
s s
s s
f s
80%
s f
s s
s s
f f
70%
s f
s s
s f
s s
80%
s f
s s
s f
s f
70%
s f
s s
s f
f s
70%
s f
s s
s f
f f
manual shutdown s
f s
s f
s s
s 80%
s f
s s
f s
s f
70%
s f
s s
f s
f s
70%
s f
s s
f s
f f
manual shutdown s
f s
s f
f s
s 70%
s f
s s
f f
s f
manual l
\\
snutcown
. ~. _..
=
EepOI! MO.
~!*'.03 Revision Page-52 Of 6'.
TAELi a Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D A
B C
D f
s s
f f
f s
manual j
s shutdown i
)
s f
s s
f f
f f
0 1
4 j
s f
s f
s s
s s
60%
a
{
s f
s f
s s
s f
60%
t 4
i s
f s
f s
s f
s 60%
i f
s f
s f
s s
f f
60%
4 4
j s
f s
f s
f s
s 60%
1 4
,1 s
f s
f s
f s
f 60%-
i i
i s
f s
f s
f f
s 60%
1 1
\\
s f
s f
s f
f f
manual i
j shutdown j
I s
f s
f f
s s
-s 60%
4 s
f s
f f
s s
f 60%
i s
f s
f f
s f
s 60%
1
- s f
s f
f s
f f
manual 1;
j shutdown 4
s f
s f
f f
s s
60%
s f
s f
f f
s f
manual
,2 shutdown s
f s
f f
f f
s manua; shutdown s
f s
f f
f f
f 0
s f
f s
s s
s s
60%
s f
f s
s s
s f
60%
s f
f s
s s
f s
60%
?.epc: : ::c.
?.s 90 ;;3
?.evision Fage 52 cf i;
^.e. ELE 3 Wate: box Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D A
-3 C
D s
f f
s s
s f
f 60%
s f
f s
s f
s s
60%
s f
f s
s f
s f
60%
s f
f s
s f
f s
60%
s f
f s
s f
f f
manual shutdown s
f f
s f
s-s
's 60%
s f
f s
f s
s f
60%
i s
f f
s f
s f
s 60%
i s
f f
s f
s f
f manual 1
k shutdown i
s f
f s
f f
s s
60%
s f
f s
f f
s f
manual l
shutdown s
f f
s f
f f
s manual shutdown s
f f
s f
f f
f 0
i s
f f
f s
.s s
s manual shutdown s
f f
f s
s s
f manual shutdown s
f f
f s
s f
s manual shutdown s
f f
f s
s f
f manual shutdewn s
f f
f s
f s
s manual shutdevn
[-
I t
/
RepCIt.Io.
RS 90 203 Revision-3 Page 54 cf 61
(
TABLE 3 Wate2 box Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D-A B
C D
s f
f f
-s f
s f
manual shutdown s
f f
f s
f f
s manual shutdown s
f f
f s
f f
f manual shutdown s
f f
f f
s s
s manual shutdown s
f f
f f
s s
f manual shutdown s
f f
f f
s' f-s manual i
shutdown s
f f
f f
s f
f manual
(
shutdown s
f f
f f
f s
s manual l
shutdown s
f f
f f
f s
f manual shutdown s
f f
f f
f f
s manual shutdown s
f f
f f
f-f f
0
~
f s
s s
s s
s s
80%
f s
s s
s s
s f
80%
f s
s s
s-s f
s 80%
I f
s s
s s
s f-f 70%
l f
s s
s s
f s
s 80%'
f s
s s
s f
s f
70%
f s
s s
s f
f s
70%
EepCr~ MO, RS 9'
2"3 Revisien Page 55 cf i'.
l Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D A
.B C
D f
s s
s s
f f
f manual shutdown
.i f
s s
s f
s s
s 80%
i i
f s
s s
f s
s f
70%
f s
s s
f, s
f s
70%
f s
s s
f s
f f
manual shutdown f
s s
s f
f s
s 70%
f s
s s
f f
s f
manual shutdown f
s s
s f
f f
s manual shutdown i
f s
s s
f f
f f
0 f
s s
f s
s s
s 60%
f s
s f
s s
s f
60%
f s
s f
s s
f s
60%
f s
s f
s s
f f
60%
f s
s f
s f
s s
60%
f s
s f
s f
s f
60%
f s
s f
s f
f s
60%
f s
s f
s f
f f
manua' shutdown f
s s
f f
s s
s 60%
f s
s f
f s
s f
60%
f s
s f
f s
f s
60%
~_
Report :o.
RS 90-203 Revisien 0
Page 56 cf 61
(
TABLE 3 Waterbox Waterbox Waterbox Waterbox Pump Pump Pump-Pump System A
B C
D A
B'
'C D
f s
s f
f s
f f
manual shutdown f
s s
f f
f s
s 60%
f s
s
~f f
f s
f manual shutdown f
s s
f f
f f
s manual
-shutdown i
f s
s f
f f
f f
0 f
s f
s s
s s
s 60%
f s
f s
s s
s f
60%
f s
f s
s s
f s
60%
f s
f s
s s
f f
60%
f s
f s
s f
s s
60%
f s
f s
s f
s f
60%
f s
f s
s f
f s
60%
f s
f s
s f
f f
manual shutdown f
s f
s f
s s
s 60%
f s
f s
f s
s f
60%
f s
f s-f s
f s
60%
f s
f s
f s
f f
manual 3
shutdown f
s f
s f
f s
s 60%
f s
f s
f f
s f
manual shutdown f
s f
s i
f f
s manual shutdown
~
i
)
Repo:t !!O.
R5
- ::3 Revision
. age 5' cfi.
TABLE 3 Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D A
B C
D f
s f
s f
f f
f 0
f s
f f
s s
s s
manual shutdown f
s f
f s
s s
f manual shutdown f
s f
f s
s f
s manual shutdown f
s f
f s
s f
f manual shutdown f
s f
f s
f s
s manual shutdown f
s f
f s
f s
f manual shutdown f
s f
f s
f f
s manual shutdown f
s f
f s
f f
f manual shutdown f
s f
f f
s s
s manual shutdown f
s f
f f
s s
f manual shutdown f
s f
f f
s f
s manual 1
shutdow..
j 4
f s
f f
f s
f f
manual shutdown f
s f
f f
f s
s manual shutdown f
s f
f f
f s
f manual shutdown f
s f
f f
f f
s manua; shutdcwn
l
=
i i
I
.[.epo:
- 0.
F.5 90 203 l
1
..evis; n i
Fage 55 c i s.-
1 l
i TABLE 2 Waterbcx Waterbox Waterbox Waterbox Pump Pump Pump Pump System R
A B
C D
A B
C D
i f
s f
f f
f f
f 0
1 i
f f
s s
s s
s.
s 60%
i f
f s
s s
s s
f 60%
H f
f s
s s
s f
s 60%
i f
f s
s s
s f
f 60%
f f
s s
s f
s s
60%
f f
s s
s f
s f
60%
i I
f f
s s
s f
f s
60%
f f
s s
s f
f f
manual l
' shutdown
{'
f f
s s
f s
s s
60%
f f
s s
f s
s f
60%
f f
s s
f s
f s
60%
f f
s s
f s
f f
manual shutdown f
f s
s f
f s
s 60%
f f
s s
f f
s f
manual shutdown f
f s
s f
f f
s manual shutdown f
f s
s f
f f
f o
f f
s i
s s
s s
manual.
i shutdown f
f s
f s
s s
f manual shutdown f
f s
f s
s f
s manual shutdown
m Eeport ;o.
RS-9
- 2 Revision
-r Page 59 ef 6; g
TABLE 3 Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
'D A
B C
D f
f s
f s
s f
f manual shutdown f
f s
f s
f s
s manual shutdown f
f s
f s
f s
f manual shutdown f
f s
f s
f f
s manual shutdown f
f s
f s
f f
f manual shutdown I
l f
f s
f f
s s
s manual
\\
i shutdown f
f s
f f
s s
f manual shutdown l
f f
s f
f s
f s
manual shutdown f
f s
f f
s f
f manual shutdown f
f s
f f
f s
s manual shutdown l
f f
s f
f f
s f
manual shutdown f
f s
f f
f f
s manual shutdown f
f s
f f
f f
f o
1 i
l f
f f
s s
s s
s manual-shutdown f
f f
s s
s s
f manual shutdown f
f s
i s
manual shutcown
j i
R e p o r ?.'!o.
RS 9: 2:3 Eevis1:n Page 60 o f 61
(
TAE_-
Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System A
B C
D
.A
.B C
D f
f f
s s
s' f
f manual shutdown f
f f
s s
f s
s manual shutdown l
f f
f s
s f
s f
manual shutdown f
f f
s s
f f
s manual shutdown f
f f
s s
f f
f manual shutdown r
f f
f s
f s
s s
manual l
shutdown f
f.
f s
f s
s f
manual l
l shutdown f
f f
s f
s f
s manual shutdown i
f f
f s
f s
f f
manual shutdown f
f f
s
~%
f f
s s
manual shutdown f
f f
s f
f s
f manual shutdown f
f f
s f
f f
s manual shutdown f
f f
s f
f f
f manual shutdown f
f f
f s
s s
s o
f f
f f
s s
s f
0 f
f f
f s
s f
s 0
t f
f f
f s
s f
f 0
i o
Repc:: :::
ES-9:- :2 I
..e vi s 10..
Page di of 6; l
l
. n, S.7 - ;
Waterbox Waterbox Waterbox Waterbox Pump Pump Pump Pump System l
A B
C D
A B
C D
f f
f f
s f
s s
O f
f f
f s
f s
f 0
f f
f f
s f
f s
0 l
f f
f f
s f
f f
0 l
i.
f f
f f
f s
s s
0 f
f f
f f
s s
f 0
j f
f f
f f
s f
s 0
4 6
G s
6 O
f f
f f
f f
s s
o t
l f
f f
f f
f s
f 0
i
\\
f f
f f
f f
f s
o f
f f
f f
f f
f 0
.